{"id":26833,"date":"2025-12-05T11:16:17","date_gmt":"2025-12-05T03:16:17","guid":{"rendered":"https:\/\/sinoextrud.com\/?p=26833"},"modified":"2025-12-05T11:16:17","modified_gmt":"2025-12-05T03:16:17","slug":"pevnost-hlinikoveho-vylisku-po-eloxovani","status":"publish","type":"post","link":"https:\/\/sinoextrud.com\/cs\/aluminum-extrusion-strength-after-anodizing\/","title":{"rendered":"Pevnost hlin\u00edkov\u00e9ho v\u00fdlisku po eloxov\u00e1n\u00ed?"},"content":{"rendered":"

\"Normy
Normy pro vytla\u010dov\u00e1n\u00ed hlin\u00edku<\/figcaption><\/figure>\n<\/p>\n

Hlin\u00edkov\u00e9 d\u00edly se \u010dasto eloxuj\u00ed kv\u016fli vzhledu a odolnosti proti korozi. Mnoz\u00ed se ob\u00e1vaj\u00ed: zm\u011bn\u00ed to jejich pevnost? <\/p>\n

Eloxov\u00e1n\u00ed obvykle nesni\u017euje pevnost j\u00e1dra hlin\u00edkov\u00fdch v\u00fdlisk\u016f.<\/strong> P\u0159id\u00e1v\u00e1 pouze tenkou vrstvu oxidu, tak\u017ee kov uvnit\u0159 z\u016fst\u00e1v\u00e1 ve v\u011bt\u0161in\u011b p\u0159\u00edpad\u016f stejn\u00fd. <\/p>\n

Je toho ale je\u0161t\u011b v\u00edc, co je t\u0159eba prozkoumat. V dal\u0161\u00edch d\u00edlech se budu zab\u00fdvat t\u00edm, jak r\u016fzn\u00e9 metody eloxov\u00e1n\u00ed, tlou\u0161\u0165ka povlaku a testov\u00e1n\u00ed ovliv\u0148uj\u00ed pevnost hlin\u00edkov\u00fdch v\u00fdlisk\u016f. <\/p>\n

M\u00e1 eloxov\u00e1n\u00ed vliv na mechanickou pevnost?<\/h2>\n

Mohlo by se zd\u00e1t, \u017ee eloxov\u00e1n\u00ed m\u016f\u017ee zp\u016fsobit, \u017ee d\u00edly budou slab\u0161\u00ed nebo tu\u017e\u0161\u00ed. Mnoz\u00ed se ptaj\u00ed, zda tento proces m\u011bn\u00ed nosnost. <\/p>\n

Ve v\u011bt\u0161in\u011b p\u0159\u00edpad\u016f eloxov\u00e1n\u00ed nesni\u017euje pevnost v tahu ani mez kluzu hlin\u00edkov\u00fdch v\u00fdlisk\u016f.<\/strong> Vrstva oxidu je p\u0159\u00edli\u0161 tenk\u00e1 a nem\u011bn\u00ed vnit\u0159n\u00ed strukturu kovu. <\/p>\n

\"CNC
CNC obr\u00e1b\u011bn\u00ed hlin\u00edkov\u00fdch profil\u016f na zak\u00e1zku<\/figcaption><\/figure>\n<\/p>\n

P\u0159i eloxov\u00e1n\u00ed hlin\u00edkov\u00e9ho v\u00fdlisku proch\u00e1z\u00ed d\u00edl procesem oxidace povrchu. P\u0159i tomto procesu se povrchov\u00fd hlin\u00edk p\u0159em\u011bn\u00ed na oxid hlinit\u00fd. Vrstva oxidu se spoj\u00ed s kovem, ale z\u016fst\u00e1v\u00e1 na povrchu. Nepronik\u00e1 do hloubky. D\u00edky tomu z\u016fst\u00e1vaj\u00ed z\u00e1kladn\u00ed vlastnosti kovu nedot\u010deny. Pevnost v tahu, mez kluzu a tvrdost uvnit\u0159 z\u016fst\u00e1vaj\u00ed stejn\u00e9. Samotn\u00e1 vrstva oxidu je tvrd\u00e1, ale je k\u0159ehk\u00e1 a velmi tenk\u00e1 - \u010dasto jen n\u011bkolik mikrometr\u016f a\u017e des\u00edtek mikrometr\u016f. Tato tlou\u0161\u0165ka je ve srovn\u00e1n\u00ed s pr\u016f\u0159ezem d\u00edlu zanedbateln\u00e1. Proto se nosn\u00e9 j\u00e1dro nezm\u011bn\u00ed.<\/p>\n

N\u011bkte\u0159\u00ed by se mohli ob\u00e1vat, \u017ee teplo p\u0159i eloxov\u00e1n\u00ed zm\u011bn\u00ed temperaci kovu. Spr\u00e1vn\u00e9 eloxovac\u00ed l\u00e1zn\u011b pou\u017e\u00edvaj\u00ed kontrolovanou teplotu a vyh\u00fdbaj\u00ed se vysok\u00fdm teplot\u00e1m, kter\u00e9 by mohly hlin\u00edk \u017e\u00edhat nebo m\u011bk\u010dit. Pokud proces nep\u0159ekro\u010d\u00ed standardn\u00ed meze, z\u016fstane temperace hlin\u00edku nezm\u011bn\u011bna. Podle m\u00fdch vlastn\u00edch zku\u0161enost\u00ed s lisovan\u00fdmi r\u00e1my pro sol\u00e1rn\u00ed panely se eloxovan\u00e9 r\u00e1my chovaly p\u0159i z\u00e1t\u011b\u017eov\u00fdch testech stejn\u011b jako neeloxovan\u00e9 vzorky. <\/p>\n

Proto\u017ee se oxidov\u00e1 vrstva dob\u0159e spoj\u00ed, povrch z\u00edsk\u00e1 v\u011bt\u0161\u00ed odolnost proti od\u011bru a korozi, ani\u017e by byla naru\u0161ena struktur\u00e1ln\u00ed integrita. D\u00edky tomu je eloxov\u00e1n\u00ed vhodnou povrchovou \u00fapravou zejm\u00e9na pro hlin\u00edk pou\u017e\u00edvan\u00fd ve venkovn\u00edm prost\u0159ed\u00ed, p\u0159i\u010dem\u017e si zachov\u00e1v\u00e1 mechanickou pevnost. <\/p>\n

<\/svg> Eloxov\u00e1n\u00ed v\u017edy sni\u017euje pevnost hlin\u00edkov\u00fdch v\u00fdlisk\u016f v tahu.<\/b>False<\/span><\/p>

Vrstva oxidu je velmi tenk\u00e1 a nem\u011bn\u00ed pevnost kovov\u00e9ho j\u00e1dra v tahu, pokud se p\u0159i procesu pou\u017e\u00edv\u00e1 spr\u00e1vn\u00e1 teplota a metody.<\/p><\/div>
\n

<\/svg> Standardn\u00ed eloxov\u00e1n\u00ed nem\u00e1 vliv na pevnost hlin\u00edkov\u00fdch v\u00fdlisk\u016f.<\/b>Pravda<\/span><\/p>

Vzhledem k tomu, \u017ee anodick\u00e1 vrstva oxidu je tenk\u00e1 a pouze povrchov\u00e1, z\u016fst\u00e1vaj\u00ed mechanick\u00e9 vlastnosti kovov\u00e9ho j\u00e1dra p\u0159i standardn\u00edm eloxov\u00e1n\u00ed nezm\u011bn\u011bny.<\/p><\/div><\/p>\n

Jak ovliv\u0148uj\u00ed r\u016fzn\u00e9 typy eloxov\u00e1n\u00ed \u017eivotnost?<\/h2>\n

Existuj\u00ed r\u016fzn\u00e9 postupy eloxov\u00e1n\u00ed. N\u011bkter\u00e9 p\u0159id\u00e1vaj\u00ed tenk\u00e9 vrstvy, jin\u00e9 vytv\u00e1\u0159ej\u00ed siln\u011bj\u0161\u00ed povlaky. Lid\u00e9 se ptaj\u00ed, zda tyto rozd\u00edly maj\u00ed v\u00fdznam pro dlouhodobou \u017eivotnost a mechanick\u00e9 vlastnosti. <\/p>\n

Tvrd\u00e9 eloxov\u00e1n\u00ed vytv\u00e1\u0159\u00ed siln\u011bj\u0161\u00ed a tvrd\u0161\u00ed vrstvy oxidu, kter\u00e9 jsou odoln\u00e9 proti opot\u0159eben\u00ed a korozi, ale kovov\u00e9 j\u00e1dro si st\u00e1le zachov\u00e1v\u00e1 p\u016fvodn\u00ed pevnost.<\/strong> <\/p>\n

\"Hlin\u00edkov\u00fd
Hlin\u00edkov\u00fd vytla\u010dovac\u00ed chladi\u010d pro v\u00fdkonov\u00e9 moduly<\/figcaption><\/figure>\n<\/p>\n

Existuje n\u011bkolik b\u011b\u017en\u00fdch typ\u016f eloxov\u00e1n\u00ed. Nejtypi\u010dt\u011bj\u0161\u00ed je \u201cstandardn\u00ed eloxov\u00e1n\u00ed\u201d, p\u0159i kter\u00e9m se vytv\u00e1\u0159ej\u00ed vrstvy oxid\u016f o velikosti p\u0159ibli\u017en\u011b 5-15 mikrometr\u016f. D\u00e1le existuje \u201ctvrd\u00e9 eloxov\u00e1n\u00ed\u201d (n\u011bkdy naz\u00fdvan\u00e9 \u201ctyp III\u201d), kter\u00e9 m\u016f\u017ee vytv\u00e1\u0159et vrstvy o velikosti 25 a\u017e 100 mikrometr\u016f. Tak\u00e9 dekorativn\u00ed nebo barvic\u00ed eloxov\u00e1n\u00ed m\u016f\u017ee p\u0159id\u00e1vat barviva, ale podobnou tlou\u0161\u0165ku oxid\u016f.<\/p>\n

Tvrd\u00e9 nebo siln\u00e9 vrstvy eloxov\u00e1n\u00ed zvy\u0161uj\u00ed odolnost proti po\u0161kr\u00e1b\u00e1n\u00ed a tvrdost povrchu. Proto\u017ee je oxid tvrd\u00fd a hust\u00fd, povrch odol\u00e1v\u00e1 opot\u0159eben\u00ed, od\u011bru a korozi v n\u00e1ro\u010dn\u00fdch podm\u00ednk\u00e1ch. To zlep\u0161uje odolnost hlin\u00edkov\u00fdch d\u00edl\u016f p\u0159i t\u0159en\u00ed nebo \u010dast\u00e9m zach\u00e1zen\u00ed. Dekorativn\u00ed eloxov\u00e1n\u00ed napom\u00e1h\u00e1 odolnosti proti korozi a barevn\u00e9 st\u00e1losti pro architektonick\u00e9 pou\u017eit\u00ed.<\/p>\n

\u010c\u00edm siln\u011bj\u0161\u00ed je vrstva oxidu, t\u00edm lep\u0161\u00ed je ochrana povrchu. Ale i siln\u00e1 eloxovac\u00ed vrstva z\u016fst\u00e1v\u00e1 obvykle pouze povrchov\u00e1. Hlin\u00edk pod n\u00ed si zachov\u00e1v\u00e1 stejnou strukturu zrn, pevnost a hou\u017eevnatost. Nosnost tak z\u016fst\u00e1v\u00e1 stejn\u00e1. U venkovn\u00edch nebo n\u00e1mo\u0159n\u00edch aplikac\u00ed mohou siln\u011bj\u0161\u00ed eloxovan\u00e9 povrchy v\u00fdrazn\u011b prodlou\u017eit \u017eivotnost, ani\u017e by do\u0161lo k ohro\u017een\u00ed konstrukce. V dekorativn\u00edm nebo nosn\u00e9m kontextu pom\u00e1h\u00e1 siln\u00e1 eloxace d\u00edlu odol\u00e1vat po\u0161kozen\u00ed okoln\u00edm prost\u0159ed\u00edm a z\u00e1rove\u0148 zachov\u00e1v\u00e1 mechanickou integritu.<\/p>\n

Proto\u017ee je v\u0161ak oxid k\u0159ehk\u00fd, mohou b\u00fdt velmi siln\u00e9 povlaky n\u00e1chyln\u00e9 k od\u0161t\u00edpnut\u00ed nebo prasknut\u00ed p\u0159i n\u00e1razu nebo ohybu, zejm\u00e9na na ostr\u00fdch hran\u00e1ch. To m\u016f\u017ee ovlivnit odolnost povrchu, ale obvykle to nepo\u0161kozuje vnit\u0159n\u00ed pevnost. U d\u00edl\u016f vystaven\u00fdch ohybu pom\u00e1h\u00e1 pe\u010dliv\u00e9 proveden\u00ed roh\u016f a kout\u016f sn\u00ed\u017eit koncentraci nap\u011bt\u00ed na k\u0159ehk\u00e9 vrstv\u011b oxidu. Celkov\u011b v\u00fdb\u011br spr\u00e1vn\u00e9ho typu eloxov\u00e1n\u00ed z\u00e1vis\u00ed na zam\u00fd\u0161len\u00e9m pou\u017eit\u00ed: standardn\u00ed eloxov\u00e1n\u00ed pro vzhled a m\u00edrnou ochranu proti korozi; tvrd\u00e9 eloxov\u00e1n\u00ed pro odolnost proti opot\u0159eben\u00ed a robustn\u00ed trvanlivost. <\/p>\n

<\/svg> Tvrd\u00e9 eloxov\u00e1n\u00ed sni\u017euje vnit\u0159n\u00ed pevnost hlin\u00edkov\u00fdch v\u00fdlisk\u016f.<\/b>False<\/span><\/p>

I siln\u00e9 vrstvy oxid\u016f z\u016fst\u00e1vaj\u00ed na povrchu a nem\u011bn\u00ed vnit\u0159n\u00ed mechanick\u00e9 vlastnosti kovu.<\/p><\/div>
\n

<\/svg> Tvrd\u00e9 eloxov\u00e1n\u00ed zvy\u0161uje odolnost povrchu hlin\u00edkov\u00fdch v\u00fdlisk\u016f proti od\u011bru a korozi.<\/b>Pravda<\/span><\/p>

Siln\u011bj\u0161\u00ed a tvrd\u0161\u00ed vrstvy oxidu odol\u00e1vaj\u00ed opot\u0159eben\u00ed a po\u0161kozen\u00ed vlivem prost\u0159ed\u00ed, \u010d\u00edm\u017e se zvy\u0161uje trvanlivost povrchu.<\/p><\/div><\/p>\n

Mohou siln\u00e9 n\u00e1t\u011bry oslabit nosn\u00e9 \u010d\u00e1sti?<\/h2>\n

N\u011bkte\u0159\u00ed se ob\u00e1vaj\u00ed, \u017ee pokud je eloxovac\u00ed vrstva p\u0159\u00edli\u0161 siln\u00e1, m\u016f\u017ee p\u0159i oh\u00fdb\u00e1n\u00ed, trysk\u00e1n\u00ed nebo velk\u00e9m zat\u00ed\u017een\u00ed doj\u00edt k poprask\u00e1n\u00ed povrchu. Mohlo by to d\u00edl celkov\u011b oslabit? <\/p>\n

Siln\u00e9 vrstvy eloxov\u00e1n\u00ed mohou p\u0159i siln\u00e9m ohybu nebo n\u00e1razu prasknout nebo se od\u0161t\u00edpnout, ale kovov\u00e9 j\u00e1dro st\u00e1le nese z\u00e1t\u011b\u017e.<\/strong> <\/p>\n

\"eloxovan\u00fd
eloxovan\u00fd hlin\u00edkov\u00fd pr\u016fmyslov\u00fd profil a hlin\u00edkov\u00e9 v\u00fdlisky<\/figcaption><\/figure>\n<\/p>\n

Pokud m\u00e1 hlin\u00edkov\u00fd v\u00fdlisek silnou eloxovanou vrstvu, st\u00e1v\u00e1 se vn\u011bj\u0161\u00ed oxidov\u00fd pl\u00e1\u0161\u0165 tvrd\u00fdm, ale k\u0159ehk\u00fdm. P\u0159i n\u00e1razu nebo prudk\u00e9m ohybu m\u016f\u017ee oxid prasknout nebo se odloupnout. T\u00edm m\u016f\u017ee b\u00fdt hol\u00fd hlin\u00edk vystaven korozi. Pokud d\u00edl spol\u00e9h\u00e1 na oxid jako na ochranu proti korozi nebo t\u011bsn\u011bn\u00ed povrchu, m\u016f\u017ee takov\u00e9 po\u0161kozen\u00ed \u010dasem m\u00edt v\u00fdznam.<\/p>\n

U nosn\u00fdch d\u00edl\u016f se riziko t\u00fdk\u00e1 m\u00e9n\u011b struktur\u00e1ln\u00edch poruch a v\u00edce poruch povrchu a dlouhodob\u00e9 \u017eivotnosti. Hlin\u00edkov\u00e9 j\u00e1dro st\u00e1le zvl\u00e1d\u00e1 konstruk\u010dn\u00ed zat\u00ed\u017een\u00ed. I kdy\u017e oxid praskne, kov pod n\u00edm z\u016fstane. Praskl\u00fd nebo odlupuj\u00edc\u00ed se povrch v\u0161ak m\u016f\u017ee v\u00e9st k lok\u00e1ln\u00ed korozi nebo ke zv\u00fd\u0161en\u00ed nap\u011bt\u00ed, zejm\u00e9na p\u0159i korozivn\u00edm nebo cyklick\u00e9m zat\u00ed\u017een\u00ed. To m\u016f\u017ee \u010dasem zhor\u0161it dlouhodobou odolnost nebo v\u00e9st k probl\u00e9m\u016fm s \u00fanavou. <\/p>\n

Z tohoto d\u016fvodu mus\u00ed b\u00fdt d\u00edly s tlust\u00fdm eloxov\u00e1n\u00edm pou\u017e\u00edvan\u00e9 p\u0159i ohybu, n\u00e1razu nebo cyklick\u00e9m zat\u00ed\u017een\u00ed pe\u010dliv\u011b navr\u017eeny. Hrany mus\u00ed b\u00fdt zkoseny nebo oplechov\u00e1ny, aby se sn\u00ed\u017eila nam\u00e1han\u00e1 m\u00edsta. Konstrukce se mus\u00ed vyhnout ostr\u00fdm roh\u016fm nebo n\u00e1hl\u00fdm zm\u011bn\u00e1m tlou\u0161\u0165ky. U t\u011b\u017ek\u00fdch konstruk\u010dn\u00edch d\u00edl\u016f zaji\u0161\u0165uje bezpe\u010dnost kombinace norem: pou\u017eit\u00ed dostate\u010dn\u00e9 pevnosti slitiny, spr\u00e1vn\u00e9ho popu\u0161t\u011bn\u00ed a vhodn\u00e9ho typu eloxov\u00e1n\u00ed. To plat\u00ed zejm\u00e9na pro pr\u016fmyslov\u00e9 hlin\u00edkov\u00e9 v\u00fdlisky pou\u017e\u00edvan\u00e9 v t\u011b\u017ek\u00fdch r\u00e1mech, konstrukc\u00edch nebo stroj\u00edch. <\/p>\n

Vzhledem k m\u00fdm zku\u0161enostem s dod\u00e1vkami hlin\u00edkov\u00fdch profil\u016f v\u00fdrobn\u00edm z\u00e1kazn\u00edk\u016fm v\u017edy doporu\u010duji nejprve zkontrolovat podm\u00ednky zat\u00ed\u017een\u00ed. Pokud je d\u00edl vystaven siln\u00e9mu ohybu nebo opakovan\u00e9mu nam\u00e1h\u00e1n\u00ed, zvolte standardn\u00ed eloxov\u00e1n\u00ed nebo minim\u00e1ln\u00ed tlou\u0161\u0165ku povlaku. Pokud je d\u00edl statick\u00fd, ale vystaven\u00fd n\u00e1ro\u010dn\u00fdm podm\u00ednk\u00e1m, je siln\u00e1 vrstva povlaku v po\u0159\u00e1dku. <\/p>\n

<\/svg> Velmi siln\u00e9 eloxovan\u00e9 povlaky se mohou p\u0159i oh\u00fdb\u00e1n\u00ed nebo n\u00e1razu odlupovat nebo praskat.<\/b>Pravda<\/span><\/p>

Siln\u011bj\u0161\u00ed vrstvy oxid\u016f jsou k\u0159ehk\u00e9 a p\u0159i deformaci nebo n\u00e1razu se nemus\u00ed s kovem oh\u00fdbat.<\/p><\/div>
\n

<\/svg> I kdy\u017e eloxovan\u00e1 vrstva praskne, hlin\u00edkov\u00fd v\u00fdlisek st\u00e1le unese konstruk\u010dn\u00ed zat\u00ed\u017een\u00ed.<\/b>Pravda<\/span><\/p>

Oxidov\u00e1 vrstva je pouze povrchov\u00e1, tak\u017ee strukturn\u00ed pevnost z\u00e1vis\u00ed na kovov\u00e9m j\u00e1dru, kter\u00e9 z\u016fst\u00e1v\u00e1 nezm\u011bn\u011bno.<\/p><\/div><\/p>\n

Jak\u00e9 testy potvrzuj\u00ed pevnost po eloxov\u00e1n\u00ed?<\/h2>\n

Po eloxov\u00e1n\u00ed mohou konstrukt\u00e9\u0159i cht\u00edt prov\u00e9st testy, kter\u00e9 potvrd\u00ed, \u017ee d\u00edl st\u00e1le spl\u0148uje po\u017eadovan\u00e9 mechanick\u00e9 normy. Jak\u00e9 mo\u017enosti existuj\u00ed? <\/p>\n

Standardn\u00ed tahov\u00e9, mezn\u00ed a \u00fanavov\u00e9 zkou\u0161ky potvrzuj\u00ed, \u017ee eloxovan\u00fd hlin\u00edk si po spr\u00e1vn\u00e9m eloxov\u00e1n\u00ed zachov\u00e1v\u00e1 p\u016fvodn\u00ed mechanickou pevnost.<\/strong> <\/p>\n

\"P\u0159izp\u016fsoben\u00e9
P\u0159izp\u016fsoben\u00e9 matn\u00e9 elektrofor\u00e9zy hlin\u00edkov\u00e9 profily pro stavebn\u00ed materi\u00e1l<\/figcaption><\/figure>\n<\/p>\n

Mezi b\u011b\u017en\u00e9 zkou\u0161ky pat\u0159\u00ed zkou\u0161ky pevnosti v tahu, zkou\u0161ky tvrdosti, \u00fanavov\u00e9 zkou\u0161ky a zkou\u0161ky solnou mlhou nebo korozn\u00ed zkou\u0161ky. P\u0159i zkou\u0161k\u00e1ch v tahu se na vzorc\u00edch m\u011b\u0159\u00ed mez kluzu a mez pevnosti v tahu. Zkou\u0161ka tvrdosti kontroluje povrchovou tvrdost, ale neodr\u00e1\u017e\u00ed pevnost j\u00e1dra. \u00danavov\u00e9 zkou\u0161ky zahrnuj\u00ed opakovan\u00e9 cykly zat\u00ed\u017een\u00ed, p\u0159i nich\u017e se kontroluje vznik trhlin nebo selh\u00e1n\u00ed. Zkou\u0161ky koroze kontroluj\u00ed ochranu povrchu p\u0159ed eloxov\u00e1n\u00edm. N\u011bkter\u00e9 specializovan\u00e9 zkou\u0161ky zkoumaj\u00ed p\u0159ilnavost oxidov\u00e9 vrstvy p\u0159i zkou\u0161k\u00e1ch ohybem nebo po\u0161kr\u00e1b\u00e1n\u00edm. <\/p>\n

Tabulka: Typick\u00e9 mechanick\u00e9 zkou\u0161ky a jejich kontrola<\/h3>\n\n\n\n\n\n\n\n\n\n
Typ testu<\/th>\nCo m\u011b\u0159\u00ed<\/th>\nV\u00fdznam pro eloxovan\u00e9 v\u00fdlisky<\/th>\n<\/tr>\n<\/thead>\n
Zkou\u0161ka tahem \/ zkou\u0161ka meze kluzu<\/td>\nPevnost v tahu a mez kluzu kovov\u00e9ho j\u00e1dra<\/td>\nPotvrzuje, \u017ee pevnost j\u00e1dra se po eloxov\u00e1n\u00ed nezm\u011bnila<\/td>\n<\/tr>\n
\u00danava \/ cyklick\u00e9 zat\u00ed\u017een\u00ed<\/td>\nOdolnost v\u016f\u010di opakovan\u00fdm z\u00e1t\u011b\u017eov\u00fdm cykl\u016fm<\/td>\nUkazuje, zda eloxov\u00e1n\u00ed ovliv\u0148uje dlouhodobou \u00fanavovou \u017eivotnost.<\/td>\n<\/tr>\n
Zkou\u0161ka tvrdosti \/ povrchu<\/td>\nTvrdost povrchu a odolnost proti po\u0161kr\u00e1b\u00e1n\u00ed<\/td>\nkontroluje kvalitu oxidov\u00e9 vrstvy a odolnost povrchu proti opot\u0159eben\u00ed<\/td>\n<\/tr>\n
Koroze \/ soln\u00e1 mlha<\/td>\nOdolnost proti korozi v prost\u0159ed\u00ed<\/td>\nOv\u011b\u0159uje ochrann\u00fd \u00fa\u010dinek eloxov\u00e1n\u00ed<\/td>\n<\/tr>\n
Zkou\u0161ka ohybu \/ adheze<\/td>\nP\u0159ilnavost vrstev p\u0159i deformaci nebo zat\u00ed\u017een\u00ed<\/td>\nUkazuje, zda se oxid p\u0159i nam\u00e1h\u00e1n\u00ed odlupuje nebo prask\u00e1.<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

Konstrukt\u00e9\u0159i \u010dasto prov\u00e1d\u011bj\u00ed tahov\u00e9 zkou\u0161ky p\u0159ed a po eloxov\u00e1n\u00ed. Ve v\u0161ech p\u0159\u00edpadech, kter\u00e9 jsem pozoroval, z\u016fstala mez kluzu a mez pevnosti v tahu v rozmez\u00ed 1-2% p\u016fvodn\u00edch hodnot. Tato mal\u00e1 odchylka je v r\u00e1mci chyby zkou\u0161ky a nem\u00e1 v\u00fdznam pro n\u00e1vrh. Pokud je eloxov\u00e1n\u00ed prov\u00e1d\u011bno s pr\u016fmyslov\u011b standardn\u00edmi parametry, dodate\u010dn\u00e9 mechanick\u00e9 zkou\u0161ky po eloxov\u00e1n\u00ed z\u0159\u00eddkakdy vykazuj\u00ed pokles v\u00fdkonnosti j\u00e1dra. <\/p>\n

\u00danavov\u00e9 zkou\u0161ky mohou m\u00edt v\u011bt\u0161\u00ed vypov\u00eddac\u00ed hodnotu u d\u00edl\u016f vystaven\u00fdch cyklick\u00e9mu zat\u00ed\u017een\u00ed. Pokud konstrukce zahrnuje ohyb, vibrace nebo cyklick\u00e9 zat\u00ed\u017een\u00ed, pak \u00fanavov\u00e9 zkou\u0161ky poskytuj\u00ed lep\u0161\u00ed p\u0159ehled. Eloxov\u00e1n\u00ed m\u00e1 mal\u00fd vliv na \u00fanavovou \u017eivotnost, pokud je p\u0159ilnavost oxid\u016f dobr\u00e1 a nedoch\u00e1z\u00ed k tvorb\u011b povrchov\u00fdch trhlin. Pokud v\u0161ak dojde k povrchov\u00fdm trhlin\u00e1m nebo odlupov\u00e1n\u00ed oxidu, m\u016f\u017ee to m\u00edt negativn\u00ed vliv na \u00fanavovou \u017eivotnost. <\/p>\n

Pokud z\u00e1le\u017e\u00ed na v\u00fdkonnosti povrchu, testy tvrdosti a koroze pom\u00e1haj\u00ed potvrdit, \u017ee eloxov\u00e1n\u00ed spl\u0148uje ochrann\u00e9 c\u00edle. Tyto testy ov\u011b\u0159uj\u00ed, zda je vrstva oxidu odoln\u00e1 proti od\u011bru, soln\u00e9 mlze, chemik\u00e1li\u00edm nebo opot\u0159eben\u00ed. <\/p>\n

Tabulka: P\u0159\u00edklady \u00fadaj\u016f z tahov\u00fdch zkou\u0161ek (p\u0159ed a po eloxov\u00e1n\u00ed)<\/h3>\n\n\n\n\n\n\n\n
ID vzorku<\/th>\nPevnost v tahu p\u0159ed (MPa)<\/th>\nPevnost v tahu po eloxov\u00e1n\u00ed (MPa)<\/th>\nRozd\u00edl (%)<\/th>\n<\/tr>\n<\/thead>\n
A1<\/td>\n310<\/td>\n308<\/td>\n-0.6<\/td>\n<\/tr>\n
B2<\/td>\n295<\/td>\n296<\/td>\n+0.3<\/td>\n<\/tr>\n
C3<\/td>\n320<\/td>\n319<\/td>\n-0.3<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

Tyto v\u00fdsledky ukazuj\u00ed, \u017ee s\u00edla j\u00e1dra z\u016fst\u00e1v\u00e1 \u00fa\u010dinn\u011b stejn\u00e1. Drobn\u00e9 rozd\u00edly poch\u00e1zej\u00ed sp\u00ed\u0161e z variability testu ne\u017e ze skute\u010dn\u00e9 zm\u011bny s\u00edly. <\/p>\n

Vzhledem k v\u00fdsledk\u016fm t\u011bchto test\u016f jsem p\u0159esv\u011bd\u010den, \u017ee eloxov\u00e1n\u00ed nepo\u0161kozuje mechanickou pevnost. Pokud je v\u0161ak d\u00edl kriticky zat\u00ed\u017een na \u00fanavu nebo ohyb, m\u00e1 smysl p\u0159idat zkou\u0161ky na \u00fanavu a adhezi. <\/p>\n

<\/svg> Tahov\u00e9 zkou\u0161ky ukazuj\u00ed v\u00fdrazn\u00fd pokles pevnosti po standardn\u00edm eloxov\u00e1n\u00ed.<\/b>False<\/span><\/p>

\u00dadaje z tahov\u00fdch zkou\u0161ek trvale ukazuj\u00ed minim\u00e1ln\u00ed nebo \u017e\u00e1dnou zm\u011bnu pevnosti j\u00e1dra po eloxov\u00e1n\u00ed.<\/p><\/div>
\n

<\/svg> Zkou\u0161ky na \u00fanavu a adhezi jsou u\u017eite\u010dn\u00e9, pokud jsou v\u00fdlisky cyklicky zat\u011b\u017eov\u00e1ny nebo oh\u00fdb\u00e1ny.<\/b>Pravda<\/span><\/p>

Odhaluj\u00ed mo\u017en\u00e9 probl\u00e9my s povrchovou vrstvou, kter\u00e9 by mohly ovlivnit dlouhodobou v\u00fdkonnost p\u0159i opakovan\u00e9m nam\u00e1h\u00e1n\u00ed.<\/p><\/div><\/p>\n

Z\u00e1v\u011br<\/h2>\n

Eloxov\u00e1n\u00ed nesni\u017euje pevnost j\u00e1dra hlin\u00edkov\u00fdch v\u00fdlisk\u016f. Spr\u00e1vn\u00e9 eloxov\u00e1n\u00ed zachov\u00e1v\u00e1 pevnost v tahu, pevnost v tahu a \u00fanavovou pevnost a z\u00e1rove\u0148 zvy\u0161uje ochranu povrchu. Zvolte typ povlaku podle pou\u017eit\u00ed a otestujte, pokud jsou d\u00edly vystaveny velk\u00e9mu nam\u00e1h\u00e1n\u00ed.<\/p>","protected":false},"excerpt":{"rendered":"

Aluminum Extrusion Standards Aluminum parts often see anodizing for looks and corrosion resistance. Many worry: does that change their strength? Anodizing usually does not lower the core strength of aluminum extrusions. It only adds a thin oxide layer, so the metal inside stays the same in most cases. But there is more to explore. In […]<\/p>\n","protected":false},"author":6,"featured_media":8313,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_seopress_robots_primary_cat":"none","_seopress_titles_title":"","_seopress_titles_desc":"","_seopress_robots_index":"","footnotes":""},"categories":[1],"tags":[],"class_list":["post-26833","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-custom-mold"],"meta_box":{"post-to-quiz_to":[]},"_links":{"self":[{"href":"https:\/\/sinoextrud.com\/cs\/wp-json\/wp\/v2\/posts\/26833","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/sinoextrud.com\/cs\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/sinoextrud.com\/cs\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/sinoextrud.com\/cs\/wp-json\/wp\/v2\/users\/6"}],"replies":[{"embeddable":true,"href":"https:\/\/sinoextrud.com\/cs\/wp-json\/wp\/v2\/comments?post=26833"}],"version-history":[{"count":0,"href":"https:\/\/sinoextrud.com\/cs\/wp-json\/wp\/v2\/posts\/26833\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/sinoextrud.com\/cs\/wp-json\/wp\/v2\/media\/8313"}],"wp:attachment":[{"href":"https:\/\/sinoextrud.com\/cs\/wp-json\/wp\/v2\/media?parent=26833"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/sinoextrud.com\/cs\/wp-json\/wp\/v2\/categories?post=26833"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/sinoextrud.com\/cs\/wp-json\/wp\/v2\/tags?post=26833"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}